Klein Tools 59011 No.11 Step Drill Bit Single-fluted design eliminates skidding and makes for easier resharpening Laser-etched hole size are easy-to-read and permanent Anti-skid tip eliminates the need for center punching or pilot hole drilling for most sizes Drill multiple-size holes in thin sections of metal, plastic and wood using a single bit Works in most metals (steel, brass, aluminum, copper), as well as plastic and wood Single flute cutter for a true round hole every time Works in most metals, plastic and wood Non-walking split point tip design Permanent, easy-to-read laser-etched hole size Depth penetration for each step: 1/8-Inch Electric drill size: 1/2-Inch and larger